I have problem to send Attachments

As 3 days ago, enable the header_checks rules and Body_checks, and if they began me to work, but now I have problems to send enclosed files. Erase of the main.cf the lines #body_checks = regexp:/etc/postfix/body_checks, already with this I am not using the file body_checks, and it already allowed me to send the enclosed file. That I have to make to be able to send enclosed files using the body_checks?, OR that I have to add to the file so that it allows me to send enclosed files?